Shaft for a pen



FIG. 1 is a perspective view of a shaft for a pen, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view thereof and the lines in dotted lines are descriptive purpose only and forms no part of the invention. 

The ornamental design for a shaft for a pen, as shown and described. 